IS : 12331 · 1988 (Reaffirmed - 2012) Indian Standard GENERAL REQUIREMENTS FOR CANAL OUTLETS UDC 626·823·92 @ Copyright 1988 BUR E A U OF I N D I A N S TAN DAR D S NEW DELHI 110002 MANAK BRAVAN, 9 BAHAoDUR SHAH ZAFAR MARO Gr4 October 1988 AMENDMENT NO. 1 SEPTEMBER 2005 TO IS 12331: 1988 GENERAL REQUIREMENTS FOR CANAL OUTLETS ( Page 5, clause S.t ) - Subsbtute the folloWIng for the exisung, '5.1 Cement- It shallconfonnto IS 269 1989t, or IS 1489 (Part 1) 1991t, or IS 1489 (Part 2) 1991:, or IS 8112 1989\111 or IS 12269 1987" as specified by theengineer-m-charge ' ( Page 5, clause S.2.1 ) subclause Subsbtute the following for the existmg 5.2.1 GeneralRequirements - The compressive strengthand water absorpUon shall be m aaxmJance With IS 1<)77 1992§, or IS 12894 2002***, or IS 137S7 1993ttt ' (Page S, clause S.5) - Subsutute IS 456 2000tt' for 'IS 456 1978tt' I:' ( Page S.footnotes) - Subsbtutethe following footnotes marked 'f',' tt', and '§' forthe e~stmg 't Specification for 33 grade ordinaryPortland coment (fourth rtlvuion) ttPtaln and retnforcedconcrete- Code of pr8QttCl Clourthr.vlSlon) : Speaficatlon for Portland pozzotana cement Part 1 Ftyuh based (third revtJlon). and Put 2 CalCinedclay based (third revtl'on). §Common burm clay bUllchnabncks - SpeClfieatlon (fifth rsvJllon) · ( Page 5. footnotes) - Addthe follOWing at theend 1111 Specification for 43 grade ordinary Portland cement (fir" rmllon) " Specaficatlon for '.3 grade ordllwy Port....d cement ···Pu1venzed fbel ash- Lime bncks - SpeclficatlOll (first rsv1lJon) tttSpecdicatlon for burntclay flyuh bu1ldal1l bncks · (WRD 13) Reprocraphy Unit, 818, New Della, India IS : 12331 - 1988 Indian Standard GENERAL REQUIREMENTS FOR CANAL OUTLETS o. FO R E WO R D flow of water in it. 0.1 This Indian Standard was adopted by the Bureau of Indian Standards on 30 March 1988, after the draft finalized by the Irrigation Canals and Canal Linings Sectional Committee had been approved by the Civil Engineering Division Council. 0.3 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. -RuJes for rounding off numerical values ( revised ). 0.2 An outlet connects the water course with the distribution channel and may provide a measure of discharge passing through it. It is a device built at the head of a water course to control the 1. SCOPE 1.1 This standard covers the general requirements for outlets installed on irrigation channels after selection of the type of outlet 'in accordance with IS : 7986-1976*. This type of outlets are either with moving parts or without moving parts. In the latter case, these are called as rigid modules. Modular outlets with moving parts are not simple to design and construct, and are thus expensive. These are liable to derangements due to increase in friction, rusting of the moving parts and any obstruction in the working of moving parts caused by the silt and weeds carried in flowing water. 4.2 Non-Modular Outlets 2. TERMINOLOGY 2.1 For the purpose of this standard, the definitions given in IS : 7986-1976* shall apply. 3. GENERAL REQUIREMENTS FOR OUTLETS 3.1 An outlet shall be structurally strong and shall not have moving parts liable to derangements or requiring periodic attention. 3.2 Interference by the cultivator shall be difficult and, if made, shall be readily detectable. 4.2.1 Pipe Outlets - It consists of rectangular or circular openings and pavements. A typical layout of this class of outlet is shown in Fig. 1. A pipe outlet with one end submerged in water course is called non-modular and its discharge is calculated by the formula : q == CA .f2gH where , = 3.3 The outlet shall draw its fair share of silt carried by parent channel. 3.4 It may be possible for the outlet to work efficiently with a small working head. Larger the working head, higher the water level required in the parent channel and the cost of distribution system. acceleration due to gravity; in A .:;.;: cross-sectional area of pipe cm 2; C 3.5 The outlet shall be economical. 4. TYPFS OF OUTLETS 4.1 Modular Outlets - Modular outlets are the outlets whose discharge is independent of the water levels in the-distrlbutlng channel and the water course within reasonable working limits. ·Code of practice for canal outlets. == co-efficient of discharge which factor, depends on friction length and size of the outlet 2 x \ O' \ '\Jrf ( L + d t"Sd) ; 400 f and water H = difference or water levels in dlstributlng channel course in metres; IS : 12331 · 1981 ...-.----. rz -x FLON WATER. COURSE PLAN TOP OF BANK SECTION VV SECTION ZZ SECTION XX Note - Where necelsary Iuitable pi tchiDI may be provided at the down-stream of the pipe outlet. FIG.] PIPS OUTLBT f =- co-efficient of fluid friction for pipes. Its values would be 0·005 and 0·01 for clear and encrusted iron pipes respectively. For earthenware pipes, its value may be taken as 0·0075; at the start of water course. In this case, working head H, is the difference between water level in distributing channel and the centre of pipe outlet. L = length of pipe in metres; d q = diameter of pipe in em; and discharge outlet. in ml/sec of = an The values of C shall be in accordance with IS : 7986-1976*. 4.3.2 Open Flume Outlet - The open flume outlet is a smooth weir with a throat constructed sufficiently to ensure velocity above the critical. and long enough to ensure that the controlling section remain within the parallel throat at all discharges up to the maximum. A gradually expanding flume is provided at the outfall to obtain the maximum recovery of head. The entire work is built in brick masonry but the controlling section is generally provided with cast iron or steel bed and check plates (see Fig. 2 and Fig. 3). The pipes are fixed horizontally at right angles to flow and are laid on light concrete foundation to prevent uneven settlement and consequent leakage. 4.3 Semi-Modular Oudets The discharge is calculated by the formula: tJ == K Bt Ill" where K == constant depending upon the of the flume, width 4.3.1 Pipe Outlets - This type of outlet is independent of water level in the water course so long as minimum working head required is available. Non-modular outlet works as semi-modular if the exit end of the pipe is made to discharge water with a free faU into a cistern of 0·6 to 0·9 m ·Code of practice for canal outletl. B, == width of throat of weir in an outlet, and H == head over crest in metres. So long as a steady standing wave forms, the discharge through the outlet is independent of water level in the watcr course. For B, above 2 1811131. 1918 HEIGHT TO BE KEPT ACCORDING TO H SECTION XX b~HT~B~ SECTION VV r t · KEPT ACCORDING TO H -Where bed wIdth of channet 11 reduced below outlet downstream WInB watt should be at downstream toe of slope and up~tream wmg at upstream toe of slope tWhere bed of water course IS lower than Boor or outlet downstream eurtalD and wing walls to be taken down )0 em below bed of water course and If necessary a cIstern to be provided All dimenSions IDcentimetres FIG.2 TmPLAN OP OPEN FLUME OUTLET FOil DISTRIBUTARY ABOVE 06 mDBPTH AND HIS LIIss THAN FULL SUPPLY DBPTH I: 12331·1. WIDTH OF PARAPET IS KEPT TO SUIT THE SIZE OF ADJUSTABLE PROPORTIONAL MOOULt 'Where bed width or distributory reduced below outlet downstream winawall should be atdownstream toe of slope and upstream wina atupstream toe of slope. tWhere bed of water course islower than floor of outlet downstream curtain and wina walls to be taken down 30 em below bed or water courso and it necessary acistern tobe provided. AU dimcDsioDs in centimetres. FIG. 3 TYPB PLAN OF OPEN FLUMB OUrLBT WITH ROOF BLOCK 4 IS : 12331 · 1988 6 em and up to 9 em, K == 1'6. For Btabove 9cm and up to 12 em, K == 1'64. For Bt more thaD 12 em, K == 1'66. In practice, B, is never kept leis than 6 em, as such it becomes necessary to raise the crest of the outlet much above the bed level. Working head required in an open flume outlet with a 1 in S glacis and side walls splaying at 1 in S is 20 percent of the depth of water above the crest of outlet. This type of outlet is most suited to tail clusters and proportional distributors. NOTE - 4.3.3.1 The discharge in this type of outlet shall be calculated in accordance \\-itb IS : 7986-1976*. S. MATERIAL 5.1 Cement- It shall conform to IS: 269-1976t or IS : 1489-1976t. 5.2 Bricks - Bricks shall measure 190 x 90 X 90 mm or 190 x 90 X 40 mm with tolerance per 20 bricks as liven below : a) Length: 372 to 388 em ( 380 ± 8 cm ), b) Width: 176 to 184cm ( 180 ± 4 cm), c) Height: 176 to 184 em ( 180 ± 4 cm ) for 90 mm high bricks, and 76 to 84 cm ( 80 ± 4 em ) for 40 mm high bricks. 4.3.3 Crump's Adjustable Proportional Module ( Crump's APM) - This typo is most commonly used outlet under this class. In this type of outlet, CI base, CI roof block and check plates on either side form the nucleus around which masonry Is built. The roof block IS fixed to check plates by bolts which may be removed and the depth of outlet adjusted after the masonry is dismentled. This type of outlet cannot easily be tempered with and at the same time may be conveniently adjusted at a very small cost. Typical layout is shown in Fig. 4. The setting of the wing wall can be calculated by the following formula: W = K 5.2.1 General Requirements - The compressive strength and water absorption shall be in accordance with IS : 1077-1986§. 5.3 Sand for Mortal - The sand shall consist of natural sand, crushed stone or crushed gravel sand or a combination of any of these. The sand shall be hard, durable, clean and free from adherent coatings and organic matter and shall not contain the amount of clay, Slit and fine dust more than the specified in IS : 2116-198011. t ~ ( Bu + DI2 ) where W = settmg forward of the dIs wing 5.3.1 Grading of Sand - Grading of sand shall be in accordance with IS : 2116-198011 and IS : 1542-1977'. 5.4 Aggregates for Concrete - Fine and coarse aggregates for plain and reinforced concrete shall be in accordance with IS : 383-1970*·. 5.5 Concrete - Plain and reinforced concrete shall be in accordance with IS : 456-1978tt. 5.6 Water - Water fit for drinking is acceptable for making concrete or mortar. Mortar shall be free from algae, industrial or domestic waste. About 2000 ppm of suspended clay or rock particles are permissible in mixing water. The permissibJe values shall be in accordance with IS: 3860-1966~:. wall of the approach, K = ratio between the mean velocity for the entire distributing channel and the mean velocity in the part of the distributing channel where an outlet is to be Installed, q = discharge in m 8/see of an outlet, Q = discharge in m 3/see of distrlbutory channel upstream of the outlet, 5.7 Cast Iron Block. - All tbe castings shall conform to ts : 210-1978§§. tSpecification for ordinary and low heat Portland cement ( third revtsion ). tSpecificatlon for portland-pozzolana cement (second revision ). Bu == bed width of distributory channel upstream of the outlet, and .Code of practice for canal outlets. D = depth of water in distributing channel. Q (m3/sec ) Below 0'283 Over 0'283 up to 1'415 Over 1'415 up to 5'660 Over S·660 K 1·00 §Specification for common burnt clay building bricks (fourth revtsion ). 1·25 1'50 IISpecification for sand for masonry mortars ( /irst revtslon ). ~Specificatjon for sand for plaster (/irst revision). ·· Specification for coarse and fine aggregates from natural sources for concrete ( second revision ). ttCode of practice for plain and reinforced concrete ( third revision ). 2'00 5 ~tSpecification for grey iron castinlS ( third revision ). HSpecificatioD for precast cement concreto slabs for canal linings. IS : 12331 · 1988 GAUGE CHECK PLATE ROD TIE DETAILS OF ROOF BLOCK PLAN All dimensions in millimeters. FIG. 4 CRUMP's ADJUSTABLB PROPOllTIONAL MODULB 6 IS : 12331 · 1988 5.8 Earth Work a) For Non-Compactlola Zone - Earth work shaD be free from shrubs. clods and properly laid in layers of 1S em and dressed properly. b) Earth Work in Compaction Zone - Earth work in the compaction zone and under bed, wherever required, would be laid in 7·S em layers and compacted with drumuts or other mechanical compactors at optimum moisture content. c) Dry bulk density and optimum moisture content shall be in accordance with the checked field requirements. 5.8.1 After the completion of structure, there shall be DO leakage. Puddling of earth work may also be done wherever necessary behind the walls of outlet where refilling of earth work is to be done to check leakage or seepage of water ( see IS : 4701-1982* ). 5.9 Precast RCC Slab - It shall be laid in accordance with IS: 3860-1966f IS: 456-1978t, IS : 432 ( Part 1 )·1982§ and IS : 2502-1963\\. ·Code of practice for earthwork on canal. (fir at revision ). tSpecification for precast cement concrete stabs for canal linings. ~Code of practice for plain and reinforced concrete (third revision ). §Speciftcationfor mild steel and medium tensile steel bars and bard-drawn steel wire for concrete reinforcement: Part 1 Mild steel and medium tensile steel bars ( third revision ). IICode of practice for bending and fixing of bars for concrete reinforcement. 7 : BUREAU OF : :.... :.,...... ; . . INDIAN STANDARDS , M8n.~k B.havdn; '9 B'~hadrur , H/JadquaftefS: Shah Zafar Marg, NEW DELHI 110002 Telegrams: Manaksaqstha ( Common to all Offices) Telephorftls : 3 31 01 31, 331 13' 75 Regional Offices: . Central : Manak Shaven, 9 Bahaqur Shah Zafar Marg, N~W DEL.HI. 11'0002 . · ·Eastern : 1/14, C. I. T. Scheme V-'I M, V. I. P. Road, Maniktola, CALCUTTA.700054 Telephone 3 31 01 31 { 3311375 36 2499 2 18 43 { 3 1641 Northern : SCO 445-446, Sector ~5-C, OHANDIGARH 160036 Southe;n : C: 1. T, Campus, MADRAS 600113 tWestern : Manakalaya, E9 MIDC, Maro!, Andheri (East), BOMBAY 400093 Branch Offices: 'Pushpak', Nurmohamed Shaikh Marg, Khanpur, AHMADABAD 380001 Peenya Industrial Area, 1st Stage, Bangalore Tumkur Road, BANGALORE 560058 Gangotri Complex, 5th Floor, Bhadbhada Road, T. T. Nagar, BHOPAL 462003 Plot No. 82/83, Lewis Road, BHUBANESHWAR 751002 53/5. Ward No. 29. R. G. Barua Road, 5th Bylane, GUWAHATI 781003 5-8-56C, L. N. Gupta Marg (Nampally Station Roa,d), HYDERABAD 500001 R14 Yudhister Marg, C Scheme, JAI PUR 302005 117/4188 Sarvodaya Nagar, KANPUR 208005 Patliputra Industrial Estate, PATNA 800013 Hantex Bldg ( 2nd Floor ), Rly Station Road, TRIVANDRUM 695001 ~ L41 29 16 6 32 92 95 ~ 41 25 19 r41 2442 2 63 48 { 26349 38 4955 { 38 49 56 66716 63627 23 10 83 6 34 71 { 69832 21 6876 { 21 8292 62305 6 21 04 { 621 17 Inspection Offices ( With Sale Point): Pushpanjali, 205-A West High Court Road, Bharampeth Extension, NAG PUR 440010 Institution of Engineers ( India) Building, 1332 Shivaji Nagar, PUNE 411005 ·Sales Office in Calcutta is at 5 Chowringhee Approach, P. O. Princep Street, Calcutta 700072 tSales OffIce in Bombay is at Noveltv Chambers, Grant Road, Bombay 400007 251 71 52435 276800 896528